How the non-metallic and metallic properties of elements in rows change: a) carbon → silicon → germanium,

How the non-metallic and metallic properties of elements in rows change:
a) carbon → silicon → germanium,
b) aluminum → silicon → phosphorus?
How is this related to the fact that crystalline silicon is a semiconductor, like germanium?

a) metallic properties increase
b) non-metallic properties grow
Silicon and germanium are semiconductors, because are the floor of the metals located in the periodic table at the interface between metals and non-metals.

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